HEADSUP! netgraph Metadata changing.

Ruslan Ermilov ru at FreeBSD.org
Tue Jun 8 07:02:56 GMT 2004

On Tue, Jun 08, 2004 at 10:58:31AM +0400, Gleb Smirnoff wrote:
> On Tue, Jun 08, 2004 at 09:52:35AM +0300, Ruslan Ermilov wrote:
> R> > J> > J> In addition the ng_ksocket node adds info into metadata and I suspect
> R> > J> > J> there are people using that.
> R> > J> > 
> R> > J> > Since ng_ksocket tags packets for itself only, we can safely change it.
> R> > J> 
> R> > J> Since I did not add that code I am not very familiar with it or who uses
> R> > J> it. (or why)
> R> > J> 
> R> > J> if this is true than yes we can do this..
> R> > 
> R> > It is used only on UDP connection, to send replies back to where the original
> R> > packets came from.
> R> > 
> R> I wouldn't hardcode it this way.  Rather, it just mimics the
> R> sendto()/recvfrom() semantics, to represent the "to"/"from"
> R> arguments, respectively.
> Pardon, haven't understand what do you suggest. You mean, that it'll be better
> if node originating packets will insert this tag?
It's not just used "to send replies back".  In our proprietary module,
we expect the connected node to be of a type "inet/dgram/udp ksocket",
and insert tags appropriately to send datagrams to a correct router.
We also read tags to verify that the datagrams are coming from the
correct router.  And it just mimics the sendto()/recvfrom() behavior.

Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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